Round-column-clamp tightener



. c. M. MARKHAM.

ROUND COLUMN CLAMP TIGHIENER. APPLICATION FH'.ED 020.26, 19.19.

3,5764 Patentei 001;. 3,1922.

ATTORNEYS.

Patented Get. 3, 1922.

ease UNITED STATES PATENT OFFI'QE.

CHARLES M. MARKHAM, 0F MILWAUKEE, WISGONSIN.

ROUND-COLUMN-CLAME 'TIGI-ITENER.

zApplication'filed December 586; 1919. serial No. 347,619.

To all when it may concern,

Be it -known that l, CrnsnLns M. Mann- HAM. a citizen of the llnitedrStates, and resident of lllilwanlree, in the county of Milwaukee and 'tdtate of Wisconsln, have in vented new ljound=Colun1n=Clanip Tighteners, of which the following is a description, reference be ing had to the accompanying drawings, which area part of this specification.

This invention relates to improvements round colunin clamp tighteners.

This invention relates more particularly to a means for tightening the clamps for bonding or holding segmental forms or sections together in concrete constructions.

It is one otthe objects of "the present invention to provide a round column clamp tightener which is adapted to easily engage and tighten the adjustable metal straps used in holding concrete forms together.

A further object of the invention to provide a round column clamp tightener in which the means tor gripping "the metal bonding strip is pivotally connected to the clamping lever to exert strain in a straight line pull.

A further object of the invention is to provide a round column clamp which is of simple construction, is strong and durable and is well adapted for the purpose described.

With the above and other objects in view the invention consists of the improved round column clamp tightener and its parts and combinations as set forth in the claims. and all equivalents thereof.

In the accompanying drawing in which the same reference characters indicate the same parts in all of the views:

Fig. 1 is a side view of the improved round column clamp tightener shown in connection with a round column clamp, parts broken away and other parts being in section to show interior construction;

Fig. 2 is a top view of the tightener on a larger scale; and

Fig. 3 is a longitudinal sectional view thereof taken on line 3-3 of Fig. 2.

Referring to the drawing, the numeral 5 indicates a flexible metal band or strap, one

end of which is connected to a clamping member base 6, and the other end portion 5 extends between upstanding clamping ears 7. A clamping jaw 8 positioned between the ears and pivotally connected thereto extends and l'lSQflll Improvements in tends into the towards the base portion and its inner cam face is formed with teeth *9 which "bite into the strap end interposed between the said teeth and the base portion 6. The clamp member G'is formed with an extension base 6 and the portion of the cam face of greater diameter extends towards this extension so that the cam member will automatically clamp the strap end engaged thereby.

The clamp tightener which coacts with the clamping member and its metalstrap 'comprises a lever member 10 having a handle portion l'han angular or hooked end por tion 11 which is adapted to engage the an- 'gular end portion 12 of theclamp extension member 10 is formed wlth an i Th e lever opening 13 and a clampinginember Hera opening and is pivotally connected to the pivotrpin l5. Said clamping member is formed with a transversely extending fixed j aw 16 and a movable'j aw 17 which is pivotal'ly connected to the opposite side portions of the clamping member let by a transversely extending pivotpin 18. The movside portions of the lever by a able jaw ll is of cylindrical shape in cross section and is eccentrically j ournaled on the pivot pin 18 to approximately close the strap space 19 between thesaid movable and iiXed'jawswhen the movable jaw is in Its closest position to the fixed jaw to clainp the strap portion 5 extending between the two jaws. The strap engaging portionof the movable jaw is serrated or formed with teeth 20 which bite into the portion of the strap engaged and more firmly clamps the said strap portion. The movable jaw is also provided with a projecting lug 21 which acts as a stop to limit the movement of the movable jaw towards the clamping member.

In use the free end 5 of the metal strap is extended between the clamping jaws l6 and 17 and through the opening 13 of the lever member, and the weight of the movable eccentrioally pivoted jaw will cause it to swing into biting engagement with the strap as shown in Fig. 1. The hooked end of the lever is placed in engagement with the angular end portion of the clamplng member as a fulcrum. When thus arranged the free long end portion of the lever member is pulled away from the clamping member and the metal band or strap will be drawn tightly around the form which it encircles. If the first pull does not sufliciently tlghten the ban it on y necessary to swing the lever inwardly to automatically release the strap and upon again pulling the lever the jaws will automatically grip the strap at a point closer to the clamping member and by further pulling the strap may be tightened to the desired extent. In working the lever to and fro the clamping jaw 8 of the clamping member will automatically release and reclamp the strap to permit the tightening operation.

From the foregoing description it will be seen that the improved column clamp tightener is of very simple construction and is well adapted for the purpose described.

What I claim as my invention is:

1. A column clamp tightener, comprising a clamping base member having an angular end portion a lever member having a handle portion at one end and an angular portion at its other end for engaging the angular endv of the base member, said lever member also having a medial opening, a clamping jaw member extending into the medial opening and pivotally connected to the lever memher, a stra connected to thebase member and exten ing through the lever opening, and a movable clamping jaw member eccentrically and pivotally connected to the clamping jaw member and coacting therewith to clamp the strap therebetween when the lever member is pulled in one direction.

2. A column clamp tightener, comprising a lever member having a handle portion at one end and an angular portion at its other end for engaging the end port-ion of the vmovement of the said c column clamp, said lever member also having a medial opening, a clamping jaw member extending into the medial opening and pivotally connected to the lever member, and a cylindrical jaw member eccentrically and pivotally connected to the clamping jaw -member and coacting therewith to clamp a ber extending into the medial opening andpivotally connected to the lever member, and a cylindrical jaw member eccentrically and pivotally connected to the clamping jaw member and coacting therewith to clamp a strap therebetween when the lever member is in engagement with the end portion of the clamp member and is pulled in one direction and'to release the strap when the lever member is moved in the other direction, said cylindrical jaw member having teeth on its strap engaging face and also having a projecting portion to limit the lindrical member.

In testimony whereo ,I affix my signature.

CHARLES M. MARKHAM, 

